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. A worldwide organization of academics claims that the mean IQ score of its members is , with a standard deviation of . A randomly selected group of members of this organization is tested, and the results reveal that the mean IQ score in this sample is . If the organization's claim is correct, what is the probability of having a sample mean of or less for a random sample of this size? Document Preview: 1. A worldwide organization of academics claims that the mean IQ score of its members is , with a standard deviation of . A randomly selected group of members of this organization is tested, and the results reveal that the mean IQ score in this sample is . If the organization's claim is correct, what is the probability of having a sample mean of or less for a random sample of this size? 2. A minority representation group accuses a major bank of racial discrimination in its recent hires for financial analysts. Exactly of all applications were from minority members, and exactly of the open positions were filled by members of the minority. Find the mean of , where is the proportion of minority member applications in a random sample of that is drawn from all applications. Find the standard deviation of . Compute an approximation for , which is the probability that there will be or fewer minority member applications in a random sample of drawn from all applications. Round your answer to four decimal places. 3. Suppose that we want to estimate the mean PCB (Polychlorinated biphenyl) level in white croaker fish from the San Francisco Bay. The sample we select has a mean of parts per million and a standard deviation of parts per million. For each of the following sampling scenarios, determine which test statistic is appropriate to use when making inference statements about the population mean. (In the table, refers to a variable having a standard normal distribution, and refers to a variable having a t distribution.) 4. The lifetime of a certain brand of electric light bulb is known to have a standard deviation of hours. Suppose that a random sample of bulbs of this brand has a mean lifetime of hours. Find a confidence interval for the true mean lifetime of all light bulbs of this brand. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. What is the... Attachments: Week-1problem....doc Sep 19 2011 11:24 PM

 

Solution ID:608895 | This paper was updated on 26-Nov-2015

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